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Question

The energies of an electron in the first orbit of He+ and in the third orbit of Li2+ in joule are respectively:


Correct Answer
A
8.72×1018,2.18×1018
Your Answer
B
8.72×1018,1.96×1017
Your Answer
C
1.96×1017,2.18×1018
Your Answer
D
8.72×1017,1.96×1017

Solution

The correct option is A 8.72×1018,2.18×1018
Energy of an electron in nth orbit
 of hydrogen like species =2.18×1018Z2n2 
where Z is atomic number.
For He+
En=2.18×10182212=8.7×1018J 
For Li2+
En=2.18×10183232=2.18×1018J 

 

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